单项选择题

育种群体大小一般采用什么群体大小进行估算 A. 有效群体 B. 核心群体 C. 选择群体 D. 精选群体

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不定项选择

为了减小焊接变形，丁字梁焊接可以采用单面角焊缝

A．错误
B．正确

Private industrial networks are usually owned collectively by the major firms participating in the network, while exchanges usually are created by a single sponsoring company.

答案：错误